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Holaxonia is a suborder of soft corals, a member of the phylum Cnidaria.〔(Holaxonia ) World Register of Marine Species. Retrieved 2011-12-03.〕 Members of this suborder are sometimes known as gorgonians and include the sea blades, the sea fans, the sea rods and the sea whips. These soft corals are colonial, sessile organisms and are generally tree-like in structure. They do not have a hard skeleton composed of calcium carbonate but have a firm but pliable, central axial skeleton composed of a fibrous protein called gorgonin embedded in a tissue matrix, the coenenchyme. In some genera this is permeated with a calcareous substance in the form of fused spicules. Members of this suborder are characterized by having an unspiculated axis and often a soft, chambered central core.〔(Suborder Holaxonia ) Guide to the Shallow Water (0-200 m) Octocorals of the South Atlantic Bight. Retrieved 2011-12-05.〕 The polyps have eight-fold symmetry and in many species, especially in the families Gorgoniidae and Plexauridae, contain symbiotic photosynthetic algae called zooxanthellae. These soft corals are popular in salt water aquaria.〔(Gorgonians (Holaxonia) ) Saltcorner. Retrieved 2011-12-03.〕〔(Gorgonians ) Animal-World. Retrieved 2011-12-03.〕 ==Families and genera== The World Register of Marine Species list the following families and genera:〔 *Family Acanthogorgiidae Gray, 1859 * *Genus ''Acanthogorgia'' Gray, 1857 * *Genus ''Anthogorgia'' Verrill, 1868 * *Genus ''Calcigorgia'' Broch, 1935 * *Genus ''Calicogorgia'' Thomson & Henderson, 1906 * *Genus ''Callicigorgia'' * *Genus ''Cyclomuricea'' Nutting, 1908 * *Genus ''Muricella'' Verrill, 1868 * *Genus ''Versluysia'' Nutting, 1910 *Family Gorgoniidae Lamouroux, 1812 * *Genus ''Adelogorgia'' Bayer, 1958 * *Genus ''Eugorgia'' Verrill, 1868 * *Genus ''Eunicella'' Verrill, 1869 * *Genus ''Filigorgia'' Stiasny, 1937 * *Genus ''Gorgonia'' Linnaeus, 1758 * *Genus ''Guaiagorgia'' Grasshoff & Alderslade, 1997 * *Genus ''Hicksonella'' Nutting, 1910 * *Genus ''Leptogorgia'' Milne-Edwards, 1857 * *Genus ''Lophogorgia'' Milne-Edwards, 1857 * *Genus ''Olindagorgia'' Bayer, 1981 * *Genus ''Pacifigorgia'' Bayer, 1951 * *Genus ''Phycogorgia'' Milne Edwards & Haime, 1850 * *Genus ''Phyllogorgia'' Milne Edwards & Haime, 1850 * *Genus ''Pinnigorgia'' Grasshoff & Alderslade, 1997 * *Genus ''Antillogorgia '' Williams and Chen (2012), reasigned from Pseudopterogorgia'' Kükenthal, 1919 * *Genus ''Pterogorgia'' Ehrenberg, 1834 * *Genus ''Tobagogorgia'' Sanchez, 2007 *Family Keroeididae Kinoshita, 1910 * *Genus ''Ideogorgia'' Bayer, 1981 * *Genus ''Keroeides'' Studer, 1887 * *Genus ''Lignella'' Gray, 1870 * *Genus ''Pseudothelogorgia'' (van Ofwegen, 1990) * *Genus ''Thelogorgia'' Bayer, 1991 *Family Plexauridae Gray, 1859 * *Genus ''Acanthacis'' Deichmann, 1936 * *Genus ''Acanthomuricea'' Hentschel, 1903 * *Genus ''Alaskagorgia'' Sánchez & Cairns, 2004 * *Genus ''Anthomuricea'' Studer, 1887 * *Genus ''Anthoplexaura'' Kükenthal, 1908 * *Genus ''Astrogorgia'' Verrill, 1868 * *Genus ''Astromuricea'' Germanos, 1895 * *Genus ''Bayergorgia'' Williams & Lopez-Gonzalez, 2005 * *Genus ''Bebryce'' Philippi, 1841 * *Genus ''Cryogorgia'' Williams, 2005 * *Genus ''Dentomuricea'' Grasshoff, 1977 * *Genus ''Discogorgia'' Kükenthal, 1919 * *Genus ''Echinogorgia'' Kölliker, 1865 * *Genus ''Echinomuricea'' Verrill, 1869 * *Genus ''Elasmogorgia'' Wright & Studer, 1889 * *Genus ''Eunicea'' Lamouroux, 1816 * *Genus ''Euplexaura'' Verrill, 1869 * *Genus ''Heterogorgia'' Verrill, 1868 * *Genus ''Hypnogorgia'' Duchassaing & Michelotti, 1864 * *Genus ''Lapidogorgia'' Grasshoff, 1999 * *Genus ''Lepidomuricea'' Kükenthal, 1919 * *Genus ''Lytreia'' Bayer, 1981 * *Genus ''Menacella'' Gray, 1870 * *Genus ''Menella'' Gray, 1870 * *Genus ''Mesogligorgia'' Lopez-Gonzalez, 2007 * *Genus ''Muricea'' Lamouroux, 1821 * *Genus ''Muriceides'' Wright & Studer, 1889 * *Genus ''Muriceopsis'' Aurivillius, 1931 * *Genus ''Paracis'' Kükenthal, 1919 * *Genus ''Paramuricea'' Koelliker, 1865 * *Genus ''Paraplexaura'' Kükenthal, 1909 * *Genus ''Placogorgia'' Wright & Studer, 1889 * *Genus ''Plexaura'' Lamouroux, 1821 * *Genus ''Plexaurella'' Kölliker, 1865 * *Genus ''Psammogorgia'' Verrill, 1868 * *Genus ''Pseudoplexaura'' Wright & Studer, 1889 * *Genus ''Pseudothesea'' Kükenthal, 1919 * *Genus ''Rumphella'' Bayer, 1955 * *Genus ''Scleracis'' Kükenthal, 1919 * *Genus ''Spinimuricea'' Grasshoff, 1992 * *Genus ''Swiftia'' Duchassaing & Michelotti, 1864 * *Genus ''Thesea'' Duchassaing & Michelotti, 1860 * *Genus ''Trichogorgia'' Hickson, 1904 * *Genus ''Trimuricea'' Gordon, 1926 * *Genus ''Villogorgia'' Duchassaing & Michelloti, 1862 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Holaxonia」の詳細全文を読む スポンサード リンク
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